The new measure will very likely prompt a flurry of legal challenges. If upheld in court, it could tie the hands of future presidents on global warming.
A U.N. report reveals new details in the killing of the dissident journalist, and says that Crown Prince Mohammed must have been aware of the operation.
Air pollution has improved dramatically over the past four decades, in a large part because of federal regulations. But many areas of the country still have high levels of pollution, and climate change may make them worse.
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